Fireproof building construction



J. LALLY 'FInEPNooF BUILDING CONSTRUCTION Filed May 9, 1924 2 Sheets-Sheet 1 Feb. 26, 1929. 1:10311:

ATTORNEY Feb. 26, 1929.V 1,703,113

J. LALLY FIREPROOF BUILDING CONSTRUCTION 2 sheets-sheet 2 Filed May 9, 1924 M75/M' m ATToRNl-z Patented Feb. y26, 1929.

1,703,113 'PATENT :o1-"Fics,

JOHN LALLY, or4 GREAT NECK, NEW YORK.

. FIREPROOF BUILDING CONSTRUCTION.

Application filed May 9, 1924. Serial No. 712,011.

' invention relates to fireproof building construction and it is my objectto construct floors and ceilings of reinforced' concrete which will be light in Weight but have great load carrying capacity. A further object is to reduce the amount of concrete used and replace it by lighter and cheaper materials and to so distribute the concrete and reinforcing rods as to obtain maximum load carrying capacity with a minimum of reinforcing material and concrete thereby materially reducing the cost of construction.

In the drawing Fig. l is a plan View of my improved construction, partly in section, adjacent a column head; Fig.. 2 a

transverse sectional view showing the meth-- od of building' up the floor; Fig. 3 a transverse sectional view of my improved con-y struction between columns; and Fig. 4 a plan view, partly in section, of the structure of Fig. 3.

A column l is set up in the usual manner and mayhave a column l superimposed thereon, the connection between the two being made by any suitable means. I prefer to use columns' of steel pipe, filled with concrete and with reinforced concr'ete heads 2. Reinforcing rods 3, 3, 3, etc., are laid across the heads and a second set of rods 4, 4, 4, etc., are laid across the first set, preferably at right angles thereto forming squares. These rods' 3, 8, 3, and 4, 4, 4, must be heavy enough to carry the weight and load borne by the third and fourth sets of reinforcing rods, 3, 3', 3 etc., and 4 4',

` 4, etc., which are laid across the open spaces between the columns.

In order that the shearing strains may be better resisted extra reinforcing rods may be laid between the main rods over the column heads as indicated in Fig. 1.

A flat mould, indica-ted by the dotted line a in Fig. 2, is next built under the reinforcing rods in the'usual manner and concrete c is poured on it until it has attained a thickness about up to the plane of the reinforcing rods, about one and one half inches for a nine inch floor. This is indicated in Fig. 2 in which the dot and dash line b represents the full floor thickness.

Very light metal domes 5, 5, 5, etc, open at the bottoms and provided with peripheral flanges 6 around their open ends are next set down on the oured concrete with their closed sides up. hese domes may be ribbed .or corrugated vas shown `to obtain maximum resistanceto crushing with a minimum Aof metal so they will carry thefweight of the concrete while the latter is setting. The base area of these domes is such that they come well within the squares formed by the reinforcing bars, asbest shown in Fig. 4, and the depth of the domes for a nine inch floor is about four and one-half inches. The flanges 6 give an extended area and prevent the domes sinking into the concrete resting on the mould.

Adjacent the column heads reinforcing rods 3, 3, 3, etc., 4, 4, 4, etc., pass under domes and then come up between them and ar'e carried above the domes and across the column head so that the concrete at the column is reinforced in upper and lower planes, greatly increasing the resistance to shearing strains, which are always greatest adjacent the column.

After the domes are in position the remainder of the concrete is poured until it is about three inches thick over the domes in a nine inch floor and the domes and reinforcing rods are completelyA embedded.

By this method of construction the weight of the Hoor is lightened by the amount of concrete displaced by the domes. The load carrying capacity of the floor is maintained by reason of the fact that the reinforcing rods come between the domes and are embedded in the thickest part of the concrete resulting in a cellular floor with transverse, reinforced girders of concrete at right angles to one another. The extra reinforcing rods over the columnl heads add resistance to shearing strains so that the strength may be built up to any desired degree.

If additional strength is required' the reinforcing rods may be used in multiple as shown in Fig. 3 where a set of three such rods are illustrated at the left, a set of two at the center and one at the right hand end of the section shown, but the main rods should always be placed between the domesv tWeen the main reinforcing rods, Which main rods are embedded in the thickest part of the concrete.

This construction results in a perfectly flat floor and ceiling up to the shaft of the column and there are no projecting brackets or heads at the ceiling.

I claim: l. A sheet metal dome for cellular con- 10 crete floors comprising a top, sides and ends and a flange extending outwardly at right angles entirely around the dome from the open bottom thereof to present a bearing surface to freshly poured concrete.

2. A sheet metal dome for cellular ooncrete floors comprising a top, vertically corrugated sides and ends and a flange extending` entirely at right angles around the dome from the open bottom thereof to present a bearing surface to freshly poured concrete.

In testimony whereof I have affixed my signature.

JOHN LALLY. 

